An example of a query for a manually-outlined area: the Caucasian Reserve.

 
  Part of: Ukolov II, Romanov MS, Arkhipov VYu, Kalyakin MV, Voltzit OV (2021) Ru-Birds.RU, bird observations from Russia and neighbouring regions: an occurrence dataset. Biodiversity Data Journal 9: e76202. https://doi.org/10.3897/BDJ.9.e76202